Carbon electrode for electrical purposes.



B. REDLIGH. CARBON ELECTRODE FOR ELECTRICAL PURPOSES.

APPLICATION FILED 001. 13, 1911.

1,018,003. Patented Feb. 20, 1912.

1 111 WEB 1/1 5 Zarzzay.

- pose,

Ultra i an Per i BERTHGLD BEDLICH, 0F RAHIIBOR, GEREEANY, ASSIG-NQB, 530THE FIRM 0F SZ-IuFiNZA- WERKE AKTIENGESELLSCHAFT Fill?KOHLEIIFsiBEITKATIQN, GE RATIBQR, (i ETfi- MANY.

Specification of letters Eatent.

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Application f led Gotober 13, 1911. fierial l'o. 654,533s/ Germany,doctor of chemistry, have invented a certain new and useful Carbonrllectrode for Electrical Purposes, of which the following is aspecification.

In the'working of electric furnaces and the like when inserting newcarbon electrodes, the remainder of the old electrode was connected withthe new electrode so as to avoid any loss of material, for the purinthis. manner, of utilizing even the smallest remaining piece of carbon.The connection ofrt ew electrode with the remainder of thevoldelectrodelias been of fected in various ways, for example, the

electrodes were provided with an internally threaded boring at theirends inwhich a nipple was screwed. The connection. has also beeneflectedby means of suitable car-- bon fittings. Observations have,however, shown that when utilizing such carbonsa considerableintermediate resistance was formed. at the connecting points. In orderto avoid this disadvantage the intermediate resistance should be reducedas far as possible.

It has been previously proposed to con struct the connecting pieces ofmetal; The connection of electrodes by means oi. a suitable fitting is,however, for the purpose of permitting them to be employed in electricfurnaces without any wast-c. For this purpose it is necessary that theconnecting points as Well as theconnecting piece should be inserted inthe electric furnace and in. the fusing loath itself. The employment ofmetal connecting pieces is not suitable for this purpose, inasmuch themetal on bei. g

introduced into'the furnace lid. fuse and evaporate, so that t won. nolonger be any connection, outed would lhi.- discern age overcome if theconnecting piece is made oi carbon, in which metal bars are ei'nbedded.It has been previously proposed. to construct the connecting piece of acarbon'mass permeated with metal powder, but this would render theconnecting piece more fragile.

The fragility naturally plays an important" The inserpart for; theconnecting piece;

the purpose nrosetion of a metal bar, does not increase the fragility ofthe connecting piece, but rather decreases it, more particularly if themetal bars provided in the connecting piece diverge at both ends to formexpansions or plates. in this case if the connecting piece tact betweenthe 'connecting piece and the electrodes. A further a Vance can be madein this direction by arranging metal bars in the, electrodesthemselveswhich form contest with the metal bars. in the connectingThese metal bars also Where they encounter the threaded borings of theelec: trodes diverge to form expansions or'plates pieces.

or the like.

I shall now describe my invention with reference to the accompanyingdrawing in which- I Figure 1 shows a. connecting piece consisting of acarbon block a with a metal bar 5. The metal bar 5 can as shown in igs.2 and 3 be of round, triangular, quadrangular or polygonal. crosssection.

' Fig. i shows a connecting piece in which the carbon block a is alsoprovided with a metal insertion and in which the latter is provided atboth ends with metal plates 0. According to the drawing these plates arescrewed into the threaded bcrings J ol the electrode (see Fig. 5}. itis, however, evident that instead or the threaded borings other openingscorrespondingly formed for example dovetailed grooves might be provided.

5 shows a carbon electrode 6 with the 'hreaded borings 01 and a metalbar f pro- 'ecting into these hr-leaded borings. it is ere intended when"screwing the connecting iece a into the cringe d to form contact'etween the metal b r b of the connecting oiece and the metal bar i in.

he met a]. bars of t 1e electrodes (compare Figs. 6 and 7). The crosssection may be round, triangular,quadrangular or polyg- This latterarrangement is fun.

.1 n I /,()I the electrode. any cross section also be employed for onal,and the metal bars of the electrode as well as those of the connectingpieces can be made of steel, wrought-iron, cast-iron, or any othersuitable metal.

Fig. 8 furthermore shows that it is possible to allow the metal bar farranged in the electrode 6 and projecting withits end into the threadedboring-of the electrode, to diverge so a sto form an expansion or plateg.

What I claim as my invention and desire to secure by Letters Patentis 1. The combination with carbon electrodes for electrical purposes, ofmeans for connecting an old electrode to the new electrode comprising acarbon connecting piece, and means for equalizing the intermediateresistance of the connecting piece.

2. The combination with carbon electrodes for electrical purposes ofmeans for connecting an old electrode tothe new electrode comprising acarbo-n'connecting piece, and means for equalizing the intermediateresistance of the connecting piece, consisting of a metal core embeddedin theconnecting piece.

3. The combination with carbon electrodes for electrical purposes ofmeans for connecting an old electrode to the new electrode comprising acarbon connecting piece, and means for equalizing the intermediateresistance of the connect-ing piece, consisting of a metal core embeddedin the connecting piece, and expansions at the ends of the cores, saidexpansions being obtained by di-, verging the ends.

4. The combination with electrodes of a connecting piece consisting of ablock of carbon, and a metal core within said bloclr of carbon. t I

5. The combination with electrodes of a connecting piece consisting of ablock of carbon, and a metal core Within said block of carbon andenlargements formed atthevends of the metal core.-

6. An electrical connection comprising electrodes, metal cores in saidelectrodes, said electrodes having recessed endsfa carbon connectingpiece in said recessed ends, and metal cores in said connecting pieces,

the metal cores in the connecting pieces contacting with the metal coresin the elec-J trodes. Y

7. An electrical connection 4 comprising electrodes having internallyscrewed recesses,

onsaid metal cores, externally screwedtcarbon blocks fitting in therecesses of the elecmetal cores in said electrodes, enlarged ends 0trodes, metal cores in said. carbon blocks,

and enlarged ends on the metal cores of the blocks, said enlarged endscontacting with the enlarged ends of the electrode cores.

In testimony whereof I have hereunto,

signed my name to this specification in the presence of-two subscribingwitnesses.

BERTHOLD REDLICH. j

WVitnesses:

FRANK G. Porrs, Lorns A.; KATzI

